Gateway backend CAR traversal is using go-car v1. This pulls in deprecated dependencies. The code should be modified to use go-car/v2 to perform the equivalent functionality.

Specifically car.NewCarReaderWithOptions and car.WithErrorOnEmptyRoots are no longer supported.

This may require the go-car/v2 NewReader to accept io.Reader instead of io.ReaderAt. Or, the gateway CAR traversal will need to read the CAR data into t file first.